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added align parameter to llvm.mc.Disassembler.decode

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i cant find any method in llvm to automatically get the
correct instruction alignment for disassembling. i thought
it would be MCAsmInfo.getMinInstAlignment, but that value is
1 for the ARM target machine. since that is clearly the wrong
instruction alignment for disassembling arm, the user should
be able to configure the alignment to whatever is needed.
This commit is contained in:
anthony cantor 2013-09-05 17:51:48 -06:00 • committed by Siu Kwan Lam
commit aa264cee2d
2 changed files with 19 additions and 7 deletions
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12
test/example-disassemble.py
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@ -8,7 +8,7 @@ if llvm.version >= (3, 4):
llvm.target.initialize_all()
def print_instructions(dasm, bs):
def print_instructions(dasm, bs, align=None):
branch_properties = [
'is_branch',
'is_cond_branch',
@ -21,7 +21,7 @@ if llvm.version >= (3, 4):
]
print("print instructions")
for (addr, data, inst) in dasm.decode(bs, 0x4000):
for (addr, data, inst) in dasm.decode(bs, 0x4000, align):
if inst is None:
print("\t0x%x => (bad)" % (addr))
@ -55,6 +55,10 @@ if llvm.version >= (3, 4):
"\xea\x00\x00\x06",
"\xe2\x4d\xd0\x20",
"\xe2\x8d\xb0\x04",
"\xe5\x0b\x00\x20"
"\xe5\x0b\x00\x20",
"\x03\x30\x22\xe0", #bad instruction to test alignment
"\x73\x20\xef\xe6", #bad instruction to test alignment
"\x18\x00\x1b\xe5",
"\x10\x30\xa0\xe3"
]
print_instructions(Disassembler(arm), "".join(map(lambda s: s[::-1], code)))
print_instructions(Disassembler(arm), "".join(map(lambda s: s[::-1], code)), 4)